61012421009 has 2 divisors, whose sum is σ = 61012421010. Its totient is φ = 61012421008.

The previous prime is 61012420993. The next prime is 61012421017. The reversal of 61012421009 is 90012421016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60999120400 + 13300609 = 246980^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 61012421009 - 2⁴ = 61012420993 is a prime.

It is not a weakly prime, because it can be changed into another prime (61012421089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30506210504 + 30506210505.

It is an arithmetic number, because the mean of its divisors is an integer number (30506210505).

Almost surely, 2^61012421009 is an apocalyptic number.

It is an amenable number.

61012421009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61012421009 is an equidigital number, since it uses as much as digits as its factorization.

61012421009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 61012421009 in words is "sixty-one billion, twelve million, four hundred twenty-one thousand, nine".